package map;

import java.util.*;

public class MapDemo02 {
    public static void main(String[] args) {
        Map<String, Integer> map = new HashMap<>();
        map.put("语文", 99);
        map.put("数学", 98);
        map.put("英语", 97);
        map.put("物理", 96);
        map.put("化学", 99);
        System.out.println(map);

        Set<String> keySet = map.keySet();
        for (String key : keySet) {
            System.out.println("key:" + key);
        }
        Set<Map.Entry<String, Integer>> entries = map.entrySet();
        for (Map.Entry<String, Integer> e : entries) {
            String key = e.getKey();
            Integer value = e.getValue();
            System.out.println(key + ":" + value);
        }
        Collection<Integer> values =map.values();
        for (Integer value:values){
            System.out.println("value:"+value);
        }
        //keySet.forEach(s -> System.out.println(s));
        keySet.forEach(System.out::println);

        map.forEach((k,v)-> System.out.println(k+","+v));
    }
}
